DTC Troubleshooting: B1238 (45)
DTC B1238 or DTC indicator 45: A Problem in the Passenger's Air Mix Control Motor Circuit, Linkage, Door, or Motor
DTC Description
DTC
B1238 A problem in the passenger's air mix control motor circuit, linkage, door, or motor
  

1.
Problem verification:

Problem verification
?1.
Clear the DTCs with the HDS.


?2.
Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

?3.
Do the Self-Diagnostic Function with the HDS or the climate control unit.

?4.
Check for DTCs.
DTC Description
DTC
B1238 A problem in the passenger's air mix control motor circuit, linkage, door, or motor
  

Is DTC B1238 or 45 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure. Check for loose wires or poor connections on the passenger's air mix control motor circuit.?
2.
Open wire check (M-HOT AS line):

Open wire check (M-HOT AS line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Climate control unit 32P connector
Passenger's air mix control motor 7P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Climate control unit 32P connector: disconnected
Passenger's air mix control motor 7P connector: disconnected
Test point 1
Climate control unit 32P connector No. 29
Test point 2
Passenger's air mix control motor 7P connector No. 6


Is there continuity?

     
YES
     
     
     
The M-HOT AS wire is not open. Go to step 3.
     
NO
     
     
     
Repair an open in the wire between the climate control unit and the passenger's air mix control motor.?
3.
Open wire check (M-COOL AS line):

Open wire check (M-COOL AS line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Climate control unit 32P connector: disconnected
Passenger's air mix control motor 7P connector: disconnected
Test point 1
Climate control unit 32P connector No. 30
Test point 2
Passenger's air mix control motor 7P connector No. 7


Is there continuity?

     
YES
     
     
     
The M-COOL AS wire is not open. Go to step 4.
     
NO
     
     
     
Repair an open in the wire between the climate control unit and the passenger's air mix control motor.?
4.
Shorted wire check (M-HOT AS line):

Shorted wire check (M-HOT AS line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Climate control unit 32P connector: disconnected
Passenger's air mix control motor 7P connector: disconnected
Test point 1
Climate control unit 32P connector No. 29
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire between the climate control unit and the passenger's air mix control motor.?
     
NO
     
     
     
The M-HOT AS wire is OK. Go to step 5.
5.
Shorted wire check (M-COOL AS line):

Shorted wire check (M-COOL AS line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Climate control unit 32P connector: disconnected
Passenger's air mix control motor 7P connector: disconnected
Test point 1
Climate control unit 32P connector No. 30
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire between the climate control unit and the passenger's air mix control motor.?
     
NO
     
     
     
The M-COOL AS wire is OK. Go to step 6.
6.
Passenger's air mix control motor check:

Passenger's air mix control motor check
?1.
Test the passenger's air mix control motor.

Is the passenger's air mix control motor OK?

     
YES
     
     
     
     
NO
     
     
     
Replace the passenger's air mix control motor, or repair the passenger's air mix control linkage or door.?